CORAL FLAT-8
¥ 5,200 (1 unit, around 1973)
Commentary
A 20 cm double-cone type full range unit developed based on the technical results obtained with FLAT-5 and FLAT-6.
The diaphragm of the flat series is made of pulp, the main raw material, mixed with chemical fiber, and is specially shaped by the latest molding machine.
In addition, a hard lightweight alloy dome is adopted in the center of the diaphragm to improve the directional characteristics in the ultra-high frequency range.
The long voice coil using copper clad aluminum wire, which was also used in the beta series, is adopted to reduce amplitude distortion and improve intermodulation distortion.
A ceramic magnet with a large coercive force is used for the magnetic circuit to improve efficiency.
In conventional speaker units, when mounted on a baffle plate, cavity resonance occurs due to the thickness of the baffle hole, causing a dip or peak in the mid-range region. To solve this problem, the Flat Series employs a flat-mounting method using a prominent frame.
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Model Rating
| Type | 20 cm double cone, full range speaker |
| Nominal size | 20cm(8") |
| Impedance | 8 Ω |
| Lowest resonance frequency (fo) | 40Hz |
| Program source input | 25W |
| Output sound pressure level | 101dB |
| Playback frequency band | Fo ~ 20 kHz |
| Air gap magnetic flux density | 12,000gauss |
| Qo | 0.5(40Hz) |
| Equivalent mass | 10.3g |
| External dimensions | Diameter 248x depth 94 mm |
| Baffle Opening Dimensions | 180 φ mm (Prominent 215 φ mm) |
| Mounting Hole Position Dimension | 193 φ mm (Prominent 299 φ mm) |
| Magnet weight | 570g |
| Gross weight | 2.0kg |
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